1.6 carbs cleand
2. all new gas lines
3. new rancor filter
4. new antisiphon valve
5.new pickup tube
6.all 100% gasoline
7. teflon tape and hose clamps for no leaks
8. new yamaha bulb
ok had all this installed the 225 hp mercury ran excellent,ok the next trip it started the samething again as if it was starveing for fuel, we could pump the bulb and run maybee 3000 rpms any thing faster the bulb started to collapese . . but we could troll and run 2000rpms all day.what could i be missing. i have gone from the tank to the motor thanks.
210CCSEAPRO 225merc.
simiretired
15’ High Tide
50hp RUDE
The vent issue is a good possibility. Make sure dirtdaubbers haven’t set up housekeeping in your vent port. (Saw this happen before)
You said you replaced the fuel lines, I’m assuming the hose is large enough to provide unrestricted flow to a thirsty motor like you are running. One last thing, double check the routing on every last inch of fuel hose and make sure there aren’t any kinks or sharp bends. Seriously, look at every last inch!!
I had the same thing happen and it ended up being my fuel pump. I started digging around and some people that know a lot more about engines then me said to always re-build or replace the fuel pump if you are cleaning the carbs because of a fuel issue. Reason, if you don’t the fuel pump probably has trash in it and will either restrict fuel flow or release the trash into the carbs and you have the same issue again. Luckily for me the fuel pump did not release trash into the carbs, but once I re-built the fuel pump it ran like a top. It makes sense if you think about it because one feeds the other. If you don’t get trash out of both of them it will just reinfect that part that you didn’t clean or replace.
Hopefully the vent cap is your fix, that is an easy one.